By Uditha Jayasinghe COLOMBO (Reuters) -Sri Lanka expects to run out of fuel in days, prompting the government to close schools in Colombo and order government employees to work from home, while troops handed tokens to people lining up for petrol to keep their places in the queue. Sri Lanka is suffering its worst economic crisis in seven decades, with foreign exchange reserves at a record low and the island of 22 million struggling to pay for essential imports of food, medicine and, most critically, fuel. Industries like garments, a big dollar earner in the Indian Ocean nation, are left with f…